油气差异聚集原理应用效果分析——以黄河口凹陷为例

Analysis of application effect of hydrocarbon differential accumulation theory——Taking Huanghekou Depression as an example

王应斌 薛永安 张友 王强

Wang Yingbin Xue Yongan Zhang You Wan Qiangg

中海石油有限公司天津分公司, 天津塘沽 300452

CNOOC Ltd. Tianjin Branch, Tanggu 300452

黄河口凹陷是渤海湾盆地的富烃凹陷之一,近几年勘探发现原油超过2×108 m3,天然气超过100×108 m3,成果显著。但成功的背后,仍存在众多疑问:地质条件良好的构造上竟然钻了干井,同一个油源的相似构造,钻井结果有的以油层为主,而有的井含气层位多;同一深度段的油层,在不同井中原油密度却存在较大差异。为解决这些疑问,笔者运用差异聚集原理,首先对黄河口凹陷渤中28-2E空圈闭的形成原因进行了分析,建立了本区油气运移的模式。在此模式的指导下对渤中29-4构造开展了评价,准确预测了该构造含油气区域的分布范围,结果证明黄河口凹陷的油气运聚符合差异聚集原理。该原理能够很好的指导本区下一步的勘探,可以取得很好的经济效益。

Huanghekou depression is one of the hydrocarbon enriched depressions in Bohai Bay Basin, in which over 20×108 m3 crude oil and over 100×108 m3 gas were found in recent years. The exploration effect is remarkable, but we also have some doubt such as a well drilled in a trap with excellent geological factors turned out to be dry, oil layers mainly existed in some wells and others have more gas layers at similar structures with the same source rocks and oil density at the same depth was different in different wells. This paper tried to solve these questions by using hydrocarbon differential accumulation theory. Firstly, the forming reasons of BZ28-2E empty trap in Huanghekou depression were analyzed and a model of migration was founded, by which BZ29-4 structure was evaluated. Secondly, the distribution area of oil and gas were predicted exactly. It is proved that the petroleum migration in Huanghekou depression was in accord with hydrocarbon differential accumulation theory and it could provide direction for next step exploration.

https://doi.org/10.3969/j.issn.1008-2336.2010.04.020